I agree that it might be a while before the standard is final. And it will be even longer until all the non-HTML5 browsers are gone. But a decade? C'mon. Al

I agree that it might be a while before the standard is final. And it will be even longer until all the non-HTML5 browsers are gone. But a decade? C'mon. All 5 major browsers should have a released browser with at least a few HTML 5 capabilities by the end of the year. If your audience is targeted to newer browsers or if you're using a framework that can degrade gracefully, it shouldn't be long until you can start using this stuff on real sites. Some pretty popular sites (gmail) are already using this stuff.